use_native_backlight_dmi defaults to true now, so
video_set_use_native_backlight is a nop.  Drop it.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
[ rjw: Changelog ]
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>